diff options
Diffstat (limited to '')
| -rw-r--r-- | lib/lwres/man/lwres_gnba.docbook | 255 |
1 files changed, 255 insertions, 0 deletions
diff --git a/lib/lwres/man/lwres_gnba.docbook b/lib/lwres/man/lwres_gnba.docbook new file mode 100644 index 0000000..72e5a1c --- /dev/null +++ b/lib/lwres/man/lwres_gnba.docbook @@ -0,0 +1,255 @@ +<!DOCTYPE book [ +<!ENTITY mdash "—">]> +<!-- + - Copyright (C) Internet Systems Consortium, Inc. ("ISC") + - + - This Source Code Form is subject to the terms of the Mozilla Public + - License, v. 2.0. If a copy of the MPL was not distributed with this + - file, You can obtain one at http://mozilla.org/MPL/2.0/. + - + - See the COPYRIGHT file distributed with this work for additional + - information regarding copyright ownership. +--> + +<!-- Converted by db4-upgrade version 1.0 --> +<refentry xmlns:db="http://docbook.org/ns/docbook" version="5.0"> + <info> + <date>2007-06-18</date> + </info> + <refentryinfo> + <corpname>ISC</corpname> + <corpauthor>Internet Systems Consortium, Inc.</corpauthor> + </refentryinfo> + + <refmeta> + <refentrytitle>lwres_gnba</refentrytitle> + <manvolnum>3</manvolnum> + <refmiscinfo>BIND9</refmiscinfo> + </refmeta> + + <docinfo> + <copyright> + <year>2000</year> + <year>2001</year> + <year>2004</year> + <year>2005</year> + <year>2007</year> + <year>2014</year> + <year>2015</year> + <year>2016</year> + <year>2018</year> + <year>2019</year> + <holder>Internet Systems Consortium, Inc. ("ISC")</holder> + </copyright> + </docinfo> + + <refnamediv> + <refname>lwres_gnbarequest_render</refname> + <refname>lwres_gnbaresponse_render</refname> + <refname>lwres_gnbarequest_parse</refname> + <refname>lwres_gnbaresponse_parse</refname> + <refname>lwres_gnbaresponse_free</refname> + <refname>lwres_gnbarequest_free</refname> + <refpurpose>lightweight resolver getnamebyaddress message handling</refpurpose> + </refnamediv> + + <refsynopsisdiv> + + <funcsynopsis> +<funcsynopsisinfo> +#include <lwres/lwres.h> +</funcsynopsisinfo> + +<funcprototype> + <funcdef> +lwres_result_t +<function>lwres_gnbarequest_render</function> +</funcdef> + <paramdef>lwres_context_t *<parameter>ctx</parameter></paramdef> + <paramdef>lwres_gnbarequest_t *<parameter>req</parameter></paramdef> + <paramdef>lwres_lwpacket_t *<parameter>pkt</parameter></paramdef> + <paramdef>lwres_buffer_t *<parameter>b</parameter></paramdef> + </funcprototype> + +<funcprototype> + <funcdef> +lwres_result_t +<function>lwres_gnbaresponse_render</function> +</funcdef> + <paramdef>lwres_context_t *<parameter>ctx</parameter></paramdef> + <paramdef>lwres_gnbaresponse_t *<parameter>req</parameter></paramdef> + <paramdef>lwres_lwpacket_t *<parameter>pkt</parameter></paramdef> + <paramdef>lwres_buffer_t *<parameter>b</parameter></paramdef> + </funcprototype> +<funcprototype> + <funcdef> +lwres_result_t +<function>lwres_gnbarequest_parse</function></funcdef> + <paramdef>lwres_context_t *<parameter>ctx</parameter></paramdef> + <paramdef>lwres_buffer_t *<parameter>b</parameter></paramdef> + <paramdef>lwres_lwpacket_t *<parameter>pkt</parameter></paramdef> + <paramdef>lwres_gnbarequest_t **<parameter>structp</parameter></paramdef> + </funcprototype> +<funcprototype> + <funcdef> +lwres_result_t +<function>lwres_gnbaresponse_parse</function></funcdef> + <paramdef>lwres_context_t *<parameter>ctx</parameter></paramdef> + <paramdef>lwres_buffer_t *<parameter>b</parameter></paramdef> + <paramdef>lwres_lwpacket_t *<parameter>pkt</parameter></paramdef> + <paramdef>lwres_gnbaresponse_t **<parameter>structp</parameter></paramdef> + </funcprototype> + +<funcprototype> + <funcdef> +void +<function>lwres_gnbaresponse_free</function> +</funcdef> + <paramdef>lwres_context_t *<parameter>ctx</parameter></paramdef> + <paramdef>lwres_gnbaresponse_t **<parameter>structp</parameter></paramdef> + </funcprototype> +<funcprototype> + <funcdef> +void +<function>lwres_gnbarequest_free</function></funcdef> + <paramdef>lwres_context_t *<parameter>ctx</parameter></paramdef> + <paramdef>lwres_gnbarequest_t **<parameter>structp</parameter></paramdef> + </funcprototype> +</funcsynopsis> + + </refsynopsisdiv> + + <refsection><info><title>DESCRIPTION</title></info> + + <para> + These are low-level routines for creating and parsing + lightweight resolver address-to-name lookup request and + response messages. + </para> + <para> + There are four main functions for the getnamebyaddr opcode. + One render function converts a getnamebyaddr request structure — + <type>lwres_gnbarequest_t</type> — + to the lightweight resolver's canonical format. + It is complemented by a parse function that converts a packet in this + canonical format to a getnamebyaddr request structure. + Another render function converts the getnamebyaddr response structure + — + <type>lwres_gnbaresponse_t</type> + to the canonical format. + This is complemented by a parse function which converts a packet in + canonical format to a getnamebyaddr response structure. + </para> + <para> + These structures are defined in + <filename>lwres/lwres.h</filename>. + They are shown below. + </para> + <para><programlisting> +#define LWRES_OPCODE_GETNAMEBYADDR 0x00010002U +</programlisting> + </para> + <para><programlisting> +typedef struct { + uint32_t flags; + lwres_addr_t addr; +} lwres_gnbarequest_t; +</programlisting> + </para> + <para><programlisting> +typedef struct { + uint32_t flags; + uint16_t naliases; + char *realname; + char **aliases; + uint16_t realnamelen; + uint16_t *aliaslen; + void *base; + size_t baselen; +} lwres_gnbaresponse_t; +</programlisting> + </para> + + <para><function>lwres_gnbarequest_render()</function> + uses resolver context <varname>ctx</varname> to convert + getnamebyaddr request structure <varname>req</varname> to + canonical format. The packet header structure + <varname>pkt</varname> is initialised and transferred to buffer + <varname>b</varname>. The contents of <varname>*req</varname> + are then appended to the buffer in canonical format. + <function>lwres_gnbaresponse_render()</function> performs the + same task, except it converts a getnamebyaddr response structure + <type>lwres_gnbaresponse_t</type> to the lightweight resolver's + canonical format. + </para> + + <para><function>lwres_gnbarequest_parse()</function> + uses context <varname>ctx</varname> to convert the contents of + packet <varname>pkt</varname> to a + <type>lwres_gnbarequest_t</type> structure. Buffer + <varname>b</varname> provides space to be used for storing this + structure. When the function succeeds, the resulting + <type>lwres_gnbarequest_t</type> is made available through + <varname>*structp</varname>. + <function>lwres_gnbaresponse_parse()</function> offers the same + semantics as <function>lwres_gnbarequest_parse()</function> + except it yields a <type>lwres_gnbaresponse_t</type> structure. + </para> + + <para><function>lwres_gnbaresponse_free()</function> + and <function>lwres_gnbarequest_free()</function> release the + memory in resolver context <varname>ctx</varname> that was + allocated to the <type>lwres_gnbaresponse_t</type> or + <type>lwres_gnbarequest_t</type> structures referenced via + <varname>structp</varname>. Any memory associated with + ancillary buffers and strings for those structures is also + discarded. + </para> + </refsection> + + <refsection><info><title>RETURN VALUES</title></info> + + <para> + The getnamebyaddr opcode functions + <function>lwres_gnbarequest_render()</function>, + <function>lwres_gnbaresponse_render()</function> + <function>lwres_gnbarequest_parse()</function> + and + <function>lwres_gnbaresponse_parse()</function> + all return + <errorcode>LWRES_R_SUCCESS</errorcode> + on success. + They return + <errorcode>LWRES_R_NOMEMORY</errorcode> + if memory allocation fails. + <errorcode>LWRES_R_UNEXPECTEDEND</errorcode> + is returned if the available space in the buffer + <varname>b</varname> + is too small to accommodate the packet header or the + <type>lwres_gnbarequest_t</type> + and + <type>lwres_gnbaresponse_t</type> + structures. + <function>lwres_gnbarequest_parse()</function> + and + <function>lwres_gnbaresponse_parse()</function> + will return + <errorcode>LWRES_R_UNEXPECTEDEND</errorcode> + if the buffer is not empty after decoding the received packet. + These functions will return + <errorcode>LWRES_R_FAILURE</errorcode> + if + <varname remap="structfield">pktflags</varname> + in the packet header structure + <type>lwres_lwpacket_t</type> + indicate that the packet is not a response to an earlier query. + </para> + </refsection> + <refsection><info><title>SEE ALSO</title></info> + + <para><citerefentry> + <refentrytitle>lwres_packet</refentrytitle><manvolnum>3</manvolnum> + </citerefentry>. + </para> + </refsection> +</refentry> |